In the following we describe the searches for \(\tau ^-\rightarrow \mu ^+\mu ^-\mu ^-\) , \(\tau ^-\rightarrow \overline{p}\mu ^+\mu ^-\)  and \(\tau ^-\rightarrow p\mu ^-\mu ^-\)  decays [1]}, [2]} using samples of proton-proton collisions collected at \(\sqrt{s} = 7\mathrm {\,Te\hspace{-1.00006pt}V} \)  in 2011
and \(\sqrt{s} = 8\mathrm {\,Te\hspace{-1.00006pt}V} \)  in 2012. For the \(\tau ^-\rightarrow \overline{p}\mu ^+\mu ^-\)  and \(\tau ^-\rightarrow p\mu ^-\mu ^-\)  analyses only the 7\(\mathrm {\,Te\hspace{-1.00006pt}V}\)  dataset is used, which corresponds to an integrated luminosity of 1.0 fb\(^{-1}\) .
For the \(\tau ^-\rightarrow \mu ^+\mu ^-\mu ^-\)  analysis the addition of the 8\(\mathrm {\,Te\hspace{-1.00006pt}V}\)  sample gives a combined integrated luminosity of 3.0 fb\(^{-1}\)  and supercedes the results from Ref. [1]}.
